Dowtherm A Pysical Properties

Reference data and engineering information about dowtherm a pysical properties for hvac systems applications.

dowthermpysicalpropertiesData Table

Overview

Engineering reference data for Dowtherm A Pysical Properties in HVAC systems.

Key Formulas

Sensible Heat

$Q = \dot{m} c_p \Delta T$

Heat causing temperature change.

Latent Heat

$Q = \dot{m} h_{fg} \Delta\omega$

Heat causing moisture change.

COP (Cooling)

$COP = Q_c / W$

Coefficient of performance.

Variables

Symbol	Description	Unit
$Q$	Heat transfer	W
$\dot{m}$	Mass flow rate	kg/s
$c_p$	Specific heat of air	J/(kg·K)
$\Delta T$	Temperature difference	K

Physical Properties

The following table summarizes the key physical properties of DOWTHERM™ A.

6 rows

Selected Physical Properties of DOWTHERM™ A
Property	Value	Unit
Freeze Point	12	°C (56.6 °F)
Boiling Point (atmospheric)	257	°C (494.8 °F)
Flash Point (SETA)	113	°C (236 °F)
Fire Point (C.O.C.)	118	°C (245 °F)
Autoignition Temperature	599	°C (1110 °F)
Density (at 25°C / 77°F)	1056	kg/m³ (66 lb/ft³)

Source: engineeringtoolbox.com

Operational Conditions

DOWTHERM™ A is a eutectic mixture of biphenyl ( $C_{12}H_{10}$ ) and diphenyl oxide ( $C_{12}H_{10}O$ ). Its suitable operating ranges are:

Liquid Phase Systems: 15 °C to 400 °C (60 °F to 750 °F)
Vapor Phase Systems: 257 °C to 400 °C (495 °F to 750 °F)

References

Original Source

Source: engineeringtoolbox.com